Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc van cong snippets" » "hoc van dong snippets", "hoc van phong snippets", "hoc phan cong snippets", "hoc dan cong snippets", "hoc va cong snippets", "hoc vat cong snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("hoc van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc van cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc van cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.